Why do human beings experience jealousy, what is its function, and what are the warning signs that signal this powerful emotion may lead to violence?

Once reserved for the contemplation of poets and playwrights, jealousy is now the subject of intense scientific scrutiny. "Mate poachers abound," explains this week's guest, psychologist David Buss, who says that his research supports his hypothesis that human jealousy is an adaptation forged by evolutionary forces to deal with the problems of infidelity. Moderate jealousy, he says, is healthy and signals commitment, but there is a dark and corrosive side as well that follows a clear, predictable pattern before it destroys lives.

After the interview I discuss a news story about research into societies in which women are more competitive than men.

In every episode, before I read a bit of self delusion news, I taste a cookie baked from a recipe sent in by a listener/reader. That listener/reader wins a signed copy of my new book, “You Are Now Less Dumb,” and I post the recipe on the YANSS Pinterest page. This episode’s winner is Fernando Cordeiro who submitted a recipe for chocolate chip cookie ice cream sandwiches. Send your own recipes to david {at} youarenotsosmart.com.